package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {


    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {

//        1 查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
//        2 组装成父子的树形结构
//          1）使用stream流式计算找到所有的一级分类
        List<CategoryEntity> categoryEntities = entities.stream().filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map((menu)->{
                    menu.setChildren(getChindren(menu,entities));
                    return menu;
                })
                .sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort()) - menu2.getSort();
                })
                .collect(Collectors.toList());

        return categoryEntities;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
    //TODO 1、检查当前删除的菜单，是否被别的地方引用

        // 逻辑删除
        /**
         * 1 配置全局的逻辑删除规则
         * 2 配置逻辑删除的组件Bean(高版本省略)
         * 3 加上逻辑删除注解@TableLogic
         */
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {

        ArrayList<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);
        return parentPath.toArray(new Long[parentPath.size()]);
    }

    /**
     * 级联更新所有关联
     *
     * @param category
     */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {

        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());


    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
//        手机当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChindren(CategoryEntity root,List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
//            找到子菜单
            categoryEntity.setChildren(getChindren(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //菜单的排训
            return (menu1.getSort()==null?0:menu1.getSort()) - menu2.getSort();
        }).collect(Collectors.toList());
        return children;
    }

}